Chemical Engineering MCQs

Page No. 330

In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of__________________?


aCross linked polystyrene


bPhenol formaldehyde resins


cPolyesters


dPolyamides



Which of the following rubbers has the widest service temperature range (-75 to 275°C) ?


aButyl rubber


bSilicon rubber


cNitrile rubber


dSilicone rubber


View Answer Silicone rubber

_______________ is normally used for the manufacture of refrigerator components and transistor parts?


aPolypropylene


bPolystyrene


cPolyester


dPolyurethane


View Answer Polystyrene

Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but____________________?


aPolyacrylonitrile


bPolyamide


cSaturated polyester


dAlkyd resin


View Answer Polyacrylonitrile

Styrene butadiene rubber (SBR) is never used for making__________________?


aCoated fabrics


bFront wheel tyres of aeroplanes (i.e., heavy duty tyres)


cGaskets


dSoles of shoes



The process involved in converting rubber into a thin sheet or coating it on fabric is called__________________?


aExtrusion


bMastication


cCalendaring


dVulcanisation


View Answer Calendaring

In nylon-6, the number 6 represents the total number of_________________?


aCarbon atoms in the ring


bCarbon atoms in the linear polymer chain


cNitrogen atoms in the ring


dHydrogen atoms in the ring



Thermocol is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten__________________?


aSaturated polyester


bPolyurethane


cPolystyrene


dEither B. or C.


View Answer Either B. or C.

Phenol formaldehyde __________________?


aEmploys addition polymerisation


bEmploys condensation polymerisation


cIs a monomer


dIs an abrasive material



Which of the following is not a condensation polymer ?


aBakelite


bMelamine polymer


cPoly-methyl-methacrylate (PMMA)


dNone of these



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